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Black sheep

Idiom for oddness or disreputability

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Through Group dynamics, Family and Sheep

The term has typically carried negative implications, implying waywardness.

In psychology, the "black sheep effect" refers to the tendency of group members to judge likeable ingroup members more positively and deviant ingroup members more negatively than comparable outgroup members.

Origin

In most sheep, a white fleece is not caused by albinism but by a common dominant gene that switches color production off, thus obscuring any other color that may be present. A black fleece is caused by a recessive gene, so if a white ram and a white ewe are each heterozygous for black, about one in four of their lambs will be black. In most white sheep breeds, only a few white sheep are heterozygous for black, so black lambs are usually much rarer than this.

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